Process

WIKA
Part of your business

Solutions for pressure, temperature, force and level measurement, flow measurement, calibration and SF6 gas solutions from WIKA are an integral component of our customers' business processes.

This is why we consider ourselves to be not just suppliers of measurement components but rather more a competent partner that offers comprehensive solutions in close co-operation with our customers – customised and precisely designed products for the exact requirement.

What are 2-, 3- and 4-wire circuits?

They describe the number of wires with which the measuring resistor (e.g. a Pt100) is connected. While with the simplest 2-wire connection, the lead resistance can falsify the measuring result, this negative influence can be compensated within the 3- or 4-wire connection, and thus the accuracy of the measurement improved.

What are Profibus / FOUNDATION Fieldbus?

Profibus / FOUNDATION fieldbus are digital output signal protocols.

What are the signalling values in accordance with NAMUR?

NAMUR Downscale: 3.5 mANAMUR Upscale: 21.5 mA

What are the special features of the T32 SIL transmitter?

It has had a FMEDA analysis carried out on it. The T32 has been developed in accordance with IEC 61508 and has been manufactured accordingly. The T32 operates exclusively with active write protection.

What do "output limits" mean?

Up to these signal limits, a measuring signal is generated.

What does „Pt100“ mean?

Pt stands for Platinum with a nominal resistance of 100 Ohm at 0 °C (EN 60751).

What does 'SIL' mean?

SIL (Safety Integrity Level) refers to the standards IEC61508 / IEC61511 and describes instruments, which are used for safety-critical applications. In the event of an emergency, they must react safely and place the control circuit into a safe state.On these grounds, all components in the control circuit (sensor, logic, actuator) must have a SIL classification.The control circuit (safety loop), through special parameters (SFF, PFD, FIT), can have its Failure Probability evaluated.

What should be considered when measuring level with transmitters (potentiometers)?

What should be considered when measuring temperature with thermocouples?

For temperature measurement using thermocouples, a reference value is always needed and/or a compensation must be made. Thus, there is a sensor built into the digital transmitter (Pt100) which measures the terminal temperature (ambient temperature). (cold junction, CJC, cold junction compensation).Thermocouple connection is always 2-wire. (Caution: do not swap over the plus and minus!)No sensor short circuit monitoring is available (only sensor break monitoring)Transmitters with galvanic isolation are strongly recommended (WIKA Models T12, T32, T53).